@Entity annotation defines that a class can be mapped to a table. And that is it, it is just a marker, like for example Serializable interface. And why @Entity annotation is mandatory? … well, it is the way how JPA is designed. When you create a new entity you have to do at least two … Read more
So, finally I realized what the problem is. It is not a Jackson configuration issue as I doubted. Actually the problem was in ApplesDO Class: There was a custom constructor defined for the class making it the default constructor. Introducing a dummy constructor has made the error to go away:
In the controller, you need to add the login object as an attribute of the model: Like this:
First of all, to understand the point of @Resource you need to understand the Inversion of Control (IoC). Inversion of Control is a principle in software development which goes that the control of objects should be transferred to a container or a framework. Dependency Injection (DI) is a pattern of IoC implementation, where the control being inverted is the setting … Read more
I had this same issue when creating a Spring Boot application using their @SpringBootApplication annotation. This annotation represents @Configuration, @EnableAutoConfiguration and @ComponentScan according to the spring reference. As expected, the new annotation worked properly and my application ran smoothly but, Intellij kept complaining about unfulfilled @Autowire dependencies. As soon as I changed back to using @Configuration, @EnableAutoConfiguration and @ComponentScan separately, the errors ceased. It seems Intellij 14.0.3 (and most likely, earlier versions too) is not yet … Read more
Exactly how to do this depends on the version of Jackson that you’re using. This changed around version 1.9, before that, you could do this by adding @JsonIgnore to the getter. Which you’ve tried: Add @JsonIgnore on the getter method only Do this, and also add a specific @JsonProperty annotation for your JSON “password” field name to the setter method for the … Read more
You should autowire interface AbstractManager instead of class MailManager. If you have different implemetations of AbstractManager you can write @Component(“mailService”) and then @Autowired @Qualifier(“mailService”) combination to autowire specific class. This is due to the fact that Spring creates and uses proxy objects based on the interfaces.
It’s a function annotation. In more detail, Python 2.x has docstrings, which allow you to attach a metadata string to various types of object. This is amazingly handy, so Python 3 extends the feature by allowing you to attach metadata to functions describing their parameters and return values. There’s no preconceived use case, but the PEP … Read more
Use it every time you override a method for two benefits. Do it so that you can take advantage of the compiler checking to make sure you actually are overriding a method when you think you are. This way, if you make a common mistake of misspelling a method name or not correctly matching the … Read more